Update grpc-go and protoc versions

[mrtrkmn]

The version of protoc tool overdue (3.7.1) and the proto files are suitable with that version, however there are some improvements and new approach to create auto-generated go files in protocol buffers. It would make sense to update it at all services. To update existing tools in your local machine, it would be enough to install latest versions and apply go mod tidy.

$ go get -u github.com/golang/protobuf/{proto,protoc-gen-go}
$ go get -u google.golang.org/grpc

• add this value to daemon proto file

  option go_package = "github.com/aau-network-security/haaukins/daemon/proto";

  Update all proto files of all services, haaukins-store, haaukins-exercises, haaukins-webclient and wireguard library.

For daemon struct on Haaukins project should be by adding pb.Daemon_Server or something like this to prevent having mustEmbedUnimplementedMethod.

• Following services should be updated and tested with new version of protoc (version 3.17.3) --latest one at the time that I create the issue.

  • [x] Haaukins itself
  • [x] haaukins-store -- store.proto
  • [x] haaukins-webclient -- daemon.proto
  • [x] haaukins-exercises -- exercises.proto ~- [ ] gwireguard -- wg.proto~

[mrtrkmn]

merged #654